How to communicate from php to Android

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http://stackoverflow.com – I am making a location application, where user can parameter some function from the server, so I want the server to begin a communication with the phone of the user. But firstly, I want to open a communication with an android, from the php. Is there a way to communicate with an android phone from a php server? I already use the communication from android with HTTP to server with return of JSONObject, but I cant find anything for a php call to android. I think its exactly like the application which can make your phone ring. (HowTos)